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There were other KB aircraft at this time with designations like E.5 according to aviafrance, some with Regnier engines. At the moment I have little info apart from a few specs on the aviafrance pages and nothing on the similarities and differences with the EC.4 and ED.5. A understanding of the KB designation system would be a useful start, if anyone has it. TSRL ( talk) 07:44, 5 June 2011 (UTC) reply